| Mauro Carvalho Chehab | d835971 | 2020-03-02 09:16:07 +0100 | [diff] [blame] | 1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | |
| 3 | ====================================== |
| 4 | Linux SCSI Disk Driver (sd) Parameters |
| 5 | ====================================== |
| 6 | |
| 7 | cache_type (RW) |
| 8 | --------------- |
| 9 | Enable/disable drive write & read cache. |
| 10 | |
| 11 | =========================== === === =========== ========== |
| 12 | cache_type string WCE RCD Write cache Read cache |
| 13 | =========================== === === =========== ========== |
| 14 | write through 0 0 off on |
| 15 | none 0 1 off off |
| 16 | write back 1 0 on on |
| 17 | write back, no read (daft) 1 1 on off |
| 18 | =========================== === === =========== ========== |
| 19 | |
| 20 | To set cache type to "write back" and save this setting to the drive:: |
| 21 | |
| 22 | # echo "write back" > cache_type |
| 23 | |
| 24 | To modify the caching mode without making the change persistent, prepend |
| 25 | "temporary " to the cache type string. E.g.:: |
| 26 | |
| 27 | # echo "temporary write back" > cache_type |